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United States Patent | 5,652,745 |
Noguchi ,   et al. | July 29, 1997 |
An optical system using polarized light is provided wherein a polarized light beam from an optical source is made to coincide with the natural polarization of the optical element acting upon the light beam. The polarization of the light beam from the optical source is adjusted to be effectively the same as the natural polarization of an optical element with birefringence upon which it is incident, and consequently the birefringence of this element has no effect on the convergence of the beam.
Inventors: | Noguchi; Masato (Tokyo, JP); Ishikawa; Tsuyoshi (Tokyo, JP) |
Assignee: | Asahi Kogaku Kogyo Kabushiki Kaisha (Tokyo, JP) |
Appl. No.: | 286379 |
Filed: | August 4, 1994 |
Jul 09, 1990[JP] | 2-181184 |
Current U.S. Class: | 369/112.16; 359/494; 359/499; 369/13.29; 369/112.19; 369/112.2 |
Intern'l Class: | G11B 007/00; G02B 005/30; G02B 027/28 |
Field of Search: | 359/483-485,488,489,494-500 369/112,100,109,110,121,122,13 360/59,114 |
4397527 | Aug., 1983 | Geyer | 359/497. |
4400062 | Aug., 1983 | Mori et al. | 359/500. |
4631334 | Dec., 1986 | Masumoto et al. | |
4682311 | Jul., 1987 | Matsubayashi et al. | 369/112. |
4766303 | Aug., 1988 | Yoshizumi et al. | 359/494. |
4774615 | Sep., 1988 | Revelli et al. | 350/114. |
4789978 | Dec., 1988 | Shikama et al. | 369/112. |
4885734 | Dec., 1989 | Yuzo. | |
5029154 | Jul., 1991 | Sumi et al. | |
5033828 | Jul., 1991 | Haruta | 359/495. |
Foreign Patent Documents | |||
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0372881 | Jun., 1990 | EP. | |
3512838 | Oct., 1985 | DE. | |
3716573 | Nov., 1987 | DE. | |
3938639 | May., 1990 | DE. | |
58-108007 | Jun., 1983 | JP. | |
63-113838 | May., 1988 | JP. | |
1137435 | May., 1989 | JP. | |
1347169 | Feb., 1974 | GB. | |
1360922 | Jul., 1974 | GB. | |
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English Language Abstract of Japanese Publication, 1,137,435. English Language Abstract of JP-63-113838. English Language Abstract of Japanese Publication 02-146517. |